Smog in Los Angeles Down 85 Percent Since 1970′s

But thanks to tougher state and federal air quality standards, L.A. residents can breathe easier than they’ve been able to for decades. According to the non-profit Environment California, air pollution from cars and trucks across the state has decreased since the 1970s by more than 85 percent , with peak smog levels in the city of Los Angeles itself dropping some 70 percent. Meanwhile, California’s South Coast Air Quality Management District (AQMD) has been tracking smog levels in the area since 1976, and reports the number of ozone advisories – where residents are advised to stay indoors due to unhealthy local accumulations of smog – fell from a high of 184 days in 1977 to between zero and a few days a year now.